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  <title>Poll the items</title>

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</div><hr /><div id="zmqpoll.poll" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">ZMQPoll::poll</h1>
  <p class="verinfo">(PECL zmq &gt;= 0.5.0)</p><p class="refpurpose"><span class="refname">ZMQPoll::poll</span> &mdash; <span class="dc-title">Poll the items</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-zmqpoll.poll-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">integer</span> <span class="methodname"><strong>ZMQPoll::poll</strong></span>
    ( <span class="methodparam"><span class="type">array</span> <code class="parameter reference">&$readable</code></span>
   , <span class="methodparam"><span class="type">array</span> <code class="parameter reference">&$writable</code></span>
   [, <span class="methodparam"><span class="type">integer</span> <code class="parameter">$timeout</code><span class="initializer"> = -1</span></span>
  ] )</div>

  <p class="para rdfs-comment">
   Polls the items in the current poll set. The readable and writable items are returned in the 
   <em><code class="parameter">readable</code></em> and <em><code class="parameter">writable</code></em> parameters. 
   <span class="function"><a href="zmqpoll.getlasterrors.html" class="function">ZMQPoll::getLastErrors()</a></span> can be used to check if there were errors.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-zmqpoll.poll-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">readable</code></em></dt>

     <dd>

      <p class="para">
       Array where readable ZMQSockets/PHP streams are returned. The array
       will be cleared at the beginning of the operation.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">writable</code></em></dt>

     <dd>

      <p class="para">
       Array where writable ZMQSockets/PHP streams are returned. The array
       will be cleared at the beginning of the operation.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">timeout</code></em></dt>

     <dd>

      <p class="para">
       Timeout for the operation. -1 means that poll waits until
       at least one item has activity. Please note that starting from 
       version 1.0.0 the poll timeout is defined in milliseconds, rather
       than microseconds.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 
 <div class="refsect1 examples" id="refsect1-zmqpoll.poll-examples">
 <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4601">
    <p><strong>Example #1 A <span class="function"><strong>ZMQPoll()</strong></span> example</strong></p>
    <div class="example-contents"><p>
     Create a simple poll server
    </p></div>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br /></span><span style="color: #FF8000">/*&nbsp;Create&nbsp;socket,&nbsp;request-reply&nbsp;pattern&nbsp;(reply&nbsp;socket)&nbsp;*/<br /></span><span style="color: #0000BB">$context&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">ZMQContext</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$server&nbsp;&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$context</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getSocket</span><span style="color: #007700">(</span><span style="color: #0000BB">ZMQ</span><span style="color: #007700">::</span><span style="color: #0000BB">SOCKET_REP</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/*&nbsp;Bind&nbsp;to&nbsp;port&nbsp;5555&nbsp;on&nbsp;127.0.0.1&nbsp;*/<br /></span><span style="color: #0000BB">$server</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">bind</span><span style="color: #007700">(</span><span style="color: #DD0000">"tcp://127.0.0.1:5555"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/*&nbsp;Create&nbsp;new&nbsp;pollset&nbsp;for&nbsp;incoming/outgoing&nbsp;message&nbsp;*/<br /></span><span style="color: #0000BB">$poll&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">ZMQPoll</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">/*&nbsp;Add&nbsp;the&nbsp;object&nbsp;and&nbsp;listen&nbsp;for&nbsp;poll&nbsp;in/out&nbsp;*/<br /></span><span style="color: #0000BB">$id&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$poll</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">add</span><span style="color: #007700">(</span><span style="color: #0000BB">$server</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">ZMQ</span><span style="color: #007700">::</span><span style="color: #0000BB">POLL_IN&nbsp;</span><span style="color: #007700">|&nbsp;</span><span style="color: #0000BB">ZMQ</span><span style="color: #007700">::</span><span style="color: #0000BB">POLL_OUT</span><span style="color: #007700">);<br />echo&nbsp;</span><span style="color: #DD0000">"Added&nbsp;object&nbsp;with&nbsp;id&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$id&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/*&nbsp;Initialise&nbsp;readable&nbsp;and&nbsp;writable&nbsp;arrays&nbsp;*/<br /></span><span style="color: #0000BB">$readable&nbsp;</span><span style="color: #007700">=&nbsp;array();<br /></span><span style="color: #0000BB">$writable&nbsp;</span><span style="color: #007700">=&nbsp;array();<br /><br />while&nbsp;(</span><span style="color: #0000BB">true</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">/*&nbsp;Amount&nbsp;of&nbsp;events&nbsp;retrieved&nbsp;*/<br />&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$events&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">;<br /><br />&nbsp;&nbsp;&nbsp;try&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">/*&nbsp;Poll&nbsp;until&nbsp;there&nbsp;is&nbsp;something&nbsp;to&nbsp;do&nbsp;*/<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$events&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$poll</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">poll</span><span style="color: #007700">(</span><span style="color: #0000BB">$readable</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$writable</span><span style="color: #007700">,&nbsp;-</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$errors&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$poll</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getLastErrors</span><span style="color: #007700">();<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(</span><span style="color: #0000BB">count</span><span style="color: #007700">(</span><span style="color: #0000BB">$errors</span><span style="color: #007700">)&nbsp;&gt;&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;foreach&nbsp;(</span><span style="color: #0000BB">$errors&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$error</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"Error&nbsp;polling&nbsp;object&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$error&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;}&nbsp;catch&nbsp;(</span><span style="color: #0000BB">ZMQPollException&nbsp;$e</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"poll&nbsp;failed:&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$e</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getMessage</span><span style="color: #007700">()&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;}<br /><br />&nbsp;&nbsp;&nbsp;if&nbsp;(</span><span style="color: #0000BB">$events&nbsp;</span><span style="color: #007700">&gt;&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">/*&nbsp;Loop&nbsp;through&nbsp;readable&nbsp;objects&nbsp;and&nbsp;recv&nbsp;messages&nbsp;*/<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #007700">foreach&nbsp;(</span><span style="color: #0000BB">$readable&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$r</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;try&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"Received&nbsp;message:&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$r</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">recv</span><span style="color: #007700">()&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;catch&nbsp;(</span><span style="color: #0000BB">ZMQException&nbsp;$e</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"recv&nbsp;failed:&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$e</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getMessage</span><span style="color: #007700">()&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">/*&nbsp;Loop&nbsp;through&nbsp;writable&nbsp;and&nbsp;send&nbsp;back&nbsp;messages&nbsp;*/<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #007700">foreach&nbsp;(</span><span style="color: #0000BB">$writable&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$w</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;try&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$w</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">send</span><span style="color: #007700">(</span><span style="color: #DD0000">"Got&nbsp;it!"</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;catch&nbsp;(</span><span style="color: #0000BB">ZMQException&nbsp;$e</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"send&nbsp;failed:&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$e</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getMessage</span><span style="color: #007700">()&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;}<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>
 

 <div class="refsect1 returnvalues" id="refsect1-zmqpoll.poll-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns an integer representing amount of items with activity. Throws ZMQPollException on error.
  </p>
 </div>



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